Mysterious loud sound around 1.28 am in the city on Monday late night created panic among Ludhiana residents who took to social media to inquire that it was sonic boon, blast or thunder activity. The impact of the high-velocity sound was such that windowpane of many buildings were shattered in some areas of the city..

As rumours on the loud sound persisted, people made use of social media sites on the Internet to clarify that the loud sound was probably a thunderclap or sonic boom which was heard in many parts of Ludhiana.

An expert from defence, said that the sound might have emanated from an aircraft breaking sound barrier.

As of now, nothing can be said with absolute certainty but we can call it thunder activity.